Wrath (3.5e Cleric Domain)

From D&D Wiki

Once per day, you can designate an opponent that has damaged you in battle. You gain a +4 morale bonus to attack and damage rolls against that opponent, and targeted spells cast with the designated opponent as the target are cast with a caster level 2 higher, and with +2 to their save DC. This power lasts for 1 round per character level or until the designated opponent is dead.